Mineral jig



L. E. TUTHILL Aug. 31, 1943.

MINERAL J IG 4 5 Sheets-Sheet 1 Filed Dec. 18, 1940 L. E. TUTHILL Aug.31, 1943.

MINERAL JIG Filed Dec. 1s, 1940 5 Sheets-Sheet 2 FIG] 7 7W.. -2 L 3m IH5v s -Moo 24 Rm n v\ O, N w. Y. .MW rm y@ A G m. m MF 1E. ||.^nvv0.l\\E ..-Ta lm A3 L l u, la L mmol 3 L 5 1#4M` IM l 3 3 4w3 I 5 8. 3 4 l 3:.0u 5 6 G. \4W l F 9 F: W4 6 5 l, 5 52 64 .2 5

Aug. 31, 1943-. 1 E. TUTHILL 2,328,402

' MINERAL JIG Filed neo. 18, 1940 5 sheets-sheet 4 INVENTOR LESLIE E. TuH/LL ATTORNEYS Aug. 31, 1943. L/E. www.

MINERAL JIG Filed Dec. 18, 1940 5 Sheets-Sheet 5 stances of value ornot. `mass oflmaterial isconveyedby water.V solids contained "in theHuidVhaVingV" Patented Aug. 31, 1943 Leslies. Tuthili, seattle, wash.,assigner te L. E; y' Tuthill, Inc., Seattle, `Wash. l j

Application December 18, 1940, seriaiuas'zasri 4 claims. (ci. zoe-455)1p My invention relates to improvements in a mineral jig of the typeused in dressing ore to separate heavy materialssuch as relatively largesize mineral particles from lighter materials such as small particles ofmineral or gangue by agitating and stratifying such materials inthepresence of water or other fluids, e

It is well known that the art of`miner`al reenA covery requires careful,accuratetreatment of `mineral bearing materials in order that themaximum recovery can "be made in the ore milling operation. The placeofthe mineral jig in the circuits and methods employed in recoveringr ivaluable materials "verts in this eld. mineral jig, however,

is readily recognized' by ex- The basic principles `of a" requirerenem'ent and im- 1 usually metal shot'of a site and weight which maybevaried to determine the size and nature of "particles" tirati are tobe passed downwardly and berecovercd inthe jig asa mineral concentrate.The volume ofdownward flow is regulated by varying theidepth of the'jig`bed.

In operation, `thefjig bed, having iluid borne particles flowingthereover, is pulsated or raised periodically to 'eiect stratificationand to momentarilyopen or make permeable the jig bed to permit oreparticles having `greater specific gravity than the `material formingthe jig bed `to passtherethrough As' the periodic pulsaprovement topermit their usemore widely to treat complex ores and treat largerquantities of material with agiven machine operating power output. l l iJigs are ordinarily employed in mill circuits of both the closed andopen type andare often used between an ore Crusher and the classiiler`where the materials being treated are sorted as to size. The primarypurpose of a mineral jig is to effect an initia1 recovery of mineralvalues inthe circuit which need `not thenbe further handled throughother stagesuand `machines of recovery.` An important use of the jig isin re-` covering gold particles `from`ithe uid discharge oi the orecrusher. Such adischarge includes gold particles of vall sizes;`sulphides,` 4quartz particlesand other metallic crunch-metallic sub-They accumulation or y l arious rates of settling because oftheirdiitering specific gravities, present diiilcult separation problems-to the mill operator.

However, the employment of these diiierentialsisl'essential in= jigtreating ore in order to accomplish the desired separation. Inmillsiemploying `both the open or closed grinding circuit,oreisigrouridor `crushed and passed to a jig through suitableconduit`means and in the presence of water.` This crushed 'orebearing fluid isintroduced of a. launder or trough and is caused to owgover the "jig bedwhere it `is` activated `to produce stratification of thesolidsaccording to sise `and specific gravity. i i i The jig bed is usuallymounted ina frame having `a lower screen which may be `dividedl on itsupper face into compartments. On the upper face of the screen and inthecompertinents,4 if theybe used, is placed a quantity '-otbedding,

VThese f tionyof thejig bed `ceases `and thevindividuall members of thejig bed close together through the eiect` of gravity, `particles lighterthan the `.jig bed'are thus trapped above it and are carried away by thelateral' flowiof iluid across "the jig :Thelparticles which pass Adownthrough or permeate the bedding of the jig are collected in Va, lowerltank or hutch.` The material thus concentrated `is substantiallypurevalue suitable to be immediately reduced `to fa; marketable-productin `the form' of ingots 'or even `as metallicgranular.concentrate.y `1 j l j 'Itisw'ell known that jigsare'useful torecover Y free gold which need not be treated in thefull i millingcircuit and isqeasilyrrecovered. In `addition; jigs are useful tosimplify the flotation operation, improve the operation ofthe lters andthickeners,4 eliminate amalgamation plates aswell as for countless otherreasons. l

The jigs commonly in use heretofore have empieyed the principle ef nuidegualmente activate the jig bed;4 In accordance with these `principles aheavy periodic flow of water is applied to the under side of the jigbed. This raises the jig shot bed and separates the bedding lelements topermit the material being concentrated to settle l or permeate throughthe bed.` During uasubsetolthe jig by means V quent quiescent period thebedding returns `to rest iniits support. l j Such periodic flow of waterhas been produced rby tiltingthe jig ,frame to andfro to causetheenclosed uid to` surge from end tofend under the jig bed. Anotherformof. periodic agitation is that resulting fromtliefuse of diaphragmpistons in falwall of the jig hutch, the diaphragm being agitated' from`without `by Various types of ,mechanisms` Walking beams have, beenemployed `to `operate the diaphragmfas also. have various other typesofglinkage arrangements.

Thel result of these arrangements is to impart asurge or agitationwhichtends to rise rapidly,V

illustration,

' of illustration,

y takenon line 6-6'of Figure 3,

attain a peak, and then fall rapidly without any sustained peak. kThisis undesirable because of the extremely short period afforded forconcentrates to pass thru the jig bed.

A prolonged suspension of the jig bed will permit a greater downwardflow of materials sought to be concentrated and thus is more efficientconcentration possible. It hasA been an important object of thisinvention to lprovide a jig having a cycle of operation in whichlthesuspension period of the jig bed is prolonged to keep the shot bed openor permeable as long as possible.

Another object of my invention has been the incorporation of my novelprolonged suspension period principle into a jig without adding to thecomplexity of construction or operation of the jig. A further object ofthe invention has been the employment of a tilting beam or double bellcrank actuator mechanism having incorporated provision in a' jig of peaksustaining means operi able in conjunction with 'i the pulsator meansemployed,

rStill a further object of my invention has been to provide arifflevtrough suspending and agitating mechanism for jigs 'whichisresilientlyniountedand positively agitated to aid and en stage of anagitation cycle, in which a charge of fluid is drawn into the Yvalvedinlet chamber,

Figure 9 is a similar sectional View of a secondary stage in theagitation cycle at which point the valve chamber has been completelyfilled with a iiuid charge,

Figure l is a similar View, further disclosing a subsequent stage of theagitation cycle and more it specifically shows the relation of theelements of construction as the valved inlet ,chamber is beingdischarged of its contained uuid, i

`Figure li illustrates the final stage of the agitation cycle with theinlet chamber about to be .closed and the displacement diaphragm aboutto start its function,

Figure l2 is a perspective view of a drive shaft and crank employed inmy device,

Figure i3 is a perspective view of a slide block. used' in connectionwith the walking beam of my device, j o o Figure la is a perspectiveview of the bell cranl actuator which o erates the pulsator mechanism-oimy mineral jig; c

Figure l isa perspective View of the diaphragm plate which attaches tothe arm of a bell crank in my jig, v

Figures loand 17y are enlarged fragmentary views of the lever arms,detailing the operation of the slide blo-ck andthe manner in which theleverage applied tothe walking beam, is changed throughout a rotation ofthe crank.

Figure 18 isa vertical sectional ,view through hance particlestratication'in the cross: flowingA fluid being treated in the jig; .i

Other and more specific objects and advan v tages` of the invention willbecome apparent' during-the-course of a reading of the followingspecification andl a study of the accompanying drawingsY in which Ipresent a,` preferred embodi-r ment of myrinventio'nft will be'understood for the purposes of the descriptionrof this invention; y thatwhile I have described its application to the recoveryvof'gold'particles from fluid carrying crushedzore, I'do not wislito belimited inthe scope of myinvention to such installations. The

uses of such a device are many and varied and only limited by theingenuity of designers of ore dressingplants.

In the drawings, l i f Figurev l is a side elevation of my mineral jigwith'portionsbroken away for convenience ofV Figure 2 is a frontvelevational 'View fof my jig 'also with portionsbroken away forconvenience Figure 3 is a plan view overflow launder, 4

Figure 4 is a fragmentary sectional view taken onr line lle-1 of' Figure3, and illustrating the general arrangement of the jig bed vand anagitating baffle employed' in the combination,

vligure, '5 is a crosssectional view through the launder as though takenonline 55 of Figure 3,

' V`Figurel Gis a fragmentary cross-'sectional view Figure 'Iis'across-section ofthe agitator shaft u of the baffle take'non line 1 1tof Figure 5,

Figure 8 is a. sectional rView illustrating the pulsating mechanismaslpositioned inan initial x of the jig showing asso- 'n elatedtherewith a feed launder and a -tailing or ;r have employed theinvention, v

a modiiied form of agitation mechanism in which general principles of my-Figure 19 is -a vertical sectional View of the same nature as the-showing' of Figure i8 but illustrating a further modified form of myinvention,l v

Figure 20 is a fragmentary elevational view of an adjustment deviceemployed in a modied -v form of my invention,

lFigure 2l is a vertical sectional viewof a modi-- fled device accordingto the principles of my in- Y lvention and illustrating the mechanismadjusted by, the arrangement ofv Figure 20, and

Figure ,22 illustratesastill further form which my vinvention may' takein which a wide range of operating characteristics for the agitationmechanism may be obtained.

Referring to the drawings, the numeral 2G desT ignates a hutchhavinglower converging sides or walls formingA a settling chamber 2'! which issubstantially of inverted'conical shape and which terminates in spout 22on the lower pointed end.

A cleanout valve 23 is fitted in the spout 22 and is provided with agate24 which may be locked onoccasion.

Rising above the sloping walls of the hutch and disposed atop thesettling chamber are side walls 25 vand 26 and front and rear walls 2land 23.

The walls 25, 26, 21 Vand 23 dene a rectangular case which is dividedmedially by a `depending plate 29 forming a baiile that divides theenclosed area into an inlet chamber 3o anda pulsation --chamber 3|. l:

vIn the pulsatio-n chamber I form a supporting grid 32 which comprises aplurality of structural members arranged in crossedrelation in thepulsation chamber and secured to the walls l 2B and 33. Thegrid- 32supports the jig screen 34. Asshown in Figures 4 and 5, the jig screen3i! lies upon the upper surfaces of the grid and divides the pulsation4chamber into two zones, the

` lower adlt zone i On the upper face o! `the screen Isprovide shot`dividers 311 which segregate the sie vneeifintc Lrectangular areas `ofsubstantially .smallei-fsize "tlnthetota1-areaotthe Jlgbed.

depth `or `from one to:

i mls have been-room v l :moet` ."rhereioreido not ed; asjst "41; to l iM i curved 'and haveupperxixid lower; segmental seats n 43 respectively.Between 'the segmental `central passages l5.`

` opposedpslrs of balls'inl Seris Of rimes 50.`

y material flow across '5| is mounted in the vibration tbgtheicumels jwall of the housing 63.`

Vtained in.`thec1osed i spring 69 betweenthe stirrup` 66 andthe face 35Athe Aupper jig izone los.

The materials used to `form :heftig `prefscreen u, between the shot beddividers; to `a three'linches:- Thelyig bdd needunot bei fotihd`suitable for the purmy .reference-tcy the use ci shottoiom :ne iis bod`a'.11l"ltlls-to4 be understood-that steel shot is described for thepitt-pose or illustrationonly.

l v the upper portion-or the walls :12s and `t3 I provide vibratormounts yIl whichmay befweldthe walls. These mounts `tire seats I mountthe vibrator balls 44 which have Rime shafts 49 and Mfhave their endsdisposed in the central passages" of eochend oi' the dis bed `zone. .5By means `of the depending-amis 4I fitted on the rlllle shafts and im,rrime walls 49 which iiesubstantially parallel tothe walls and `Blf Thesewallsextend downl l vaardiy to a point justabove theupperlsnriace ofBetween walls leinspaced apart relation :isa In Figure fi 'it maybe seentht the rifllos 5l are disposed at a slightangle edges areslightlycurved or-cuppedwas at tl.

Generally the preferable practice'ls tolemploy "cuppededges directedreari the Vrimes with their wardly or with concave l faces presented ltoche thearrowlnlllguredl y i l l. i, Members 49` arepiovldedfwlthjoumalsupports li!` which rise upwardly yand mountfthe'journals 1 $8 on therectangular rullo-box,l Anasitator shaft journals 53 andispiovlded whichrotative forc `"is opwith the pillley 55 by i plied to the shaft`"Ihepulley Blimay be keyed to` shaft u ootherwise' secured; By.r`neansfoi-bolts side offthe shafts! has secured thereto l e`pluralityci'straps a1 which in tcm combineer] l o: shot :as othermateil., I mount the dependme Jfg `bed as indicated byV "oublishotvorballstot `.steeldisiplaceclon the `colis news1-ine Usuallythekdlaphragms `are formed of` heavy series `ofcbolts 19.-

* havccntral pivot holes 8| ietciiciatne disk. 1a against the Resilientdiaphragms 15 16- are securedvby openings 6I and" B2 respectively.

molded rubber to` long vlifefuniier adverse ,ccnditicme centrato cf eeendiaphragm.: se-

c'urefthediaphragm/plate 18 by means of the `Each. of the plates isprovided with `a. pair of spacedapart Betweenltheopenings 6l and'lZ`and'onthe cover 80.1 moimtivbearing standardsli which from the.perpendicular and that; theirlcwer Y passed through .thegplvot hole`bellchatillon. The bell crank lxaive'fli'xounted therein a pivot fpin8.6 that is 81 on the double n has "on either` side ofthe pivot hole,alpair of oscillatorarms 89 and l81'.' having end plvotholes 90. Pins 9iare passed through the holes Il ofthe pivot ears `onthe diaphragm platesand through the holes'Q at the outerfends Tof the leverl arms 89 and89'.`

I"Thelzvel'l crank membei` has also a pair of upf standinglarms `92,`92fwhich form theiork Sainte which is fitted the `slide block 9d ofFigure 13.

slide bloei; s4 is shown es parted for convenience of assembly. 'l l`In. journals 9E, 96' I mount the drive shaft 91 for `rotation andcentrallyoi the drivefshaft is the actuator crank 98` supported by meansof A The crank 98 isengagcd by the halveso theslideablelioui'nal slideblock 94 rotation will impart a tipping motion piston-like actlonito theflexible diaphragms.

A `drive pulley loi .is keyedV te the drive shaft `91 `in line with theagitator shaft pulley 55; An`

endless belt `H12 encii'cles th pulley 55 a`nd`-IOL A Preferably I use aV-belt of rubber composition slightly loose.

`in the manner indicated in Material is fed to the jig iaundei-A ltandtailing material is carried away by means of' theoverow lounder |05.These launders 'are placed on eitherend of the jig bed thedrawings. Inoperation in a typical installation my' jig would be placed between `thedischarge side oi" a,

i` ball mill `or othercrushing machine'and the feed.`

' means of my'machlne to classified Jfeed fmeterial l from the crushermechimode of operation. Such A dependinginlet housing 63 issecuredblowf'the opening 62 and forms theintake'chamberjd., A feed` duct65 passes `through the wall 21 intofthe position by meansof the ot thevalve plate. t t i In the lower wall of the `housing 63 V'Iialso providethe discharge `opening lllrwhichls spanned by the curved leaf spring 1|-that supports `the bolt 12 substantiallyfcentrally of` theopenlng 10.

On the outer face ofthe housing I providethe valvedlsk 13 securedto` thebolt by means of anut 14. `The normal tendency of the V'spring 1 I" upans thepilnnervterxninalyof the duct, valvedlsk 61 on` lthepin fismainlto move throughgthe anced rctai'yshaft 5E. j ing the riillesossillatei'ntherubber mount Adit in side of `a classifier mechanism. Itis `possible by run directly the unanismto the jig` foriltreatmentaccording to its afeed of material will contain `metallic as well asnon-metallic material of a great vvariety of sizes and shapes and allhaving differing,specific'gravities` y The material pa'sses'nto the jigbed zone `:from the feed launderand flows toward the overflow launder.'I'hewfirstmechanical `to this feed material is `that lencountered inthe agitating` or `vibrating `iiflles v5l! which are caused operation of`the overbal- `The `side plates 49 carryajigging manner an A `the motionof the 1jilles.be ing backward'andioryvard.` The incoming feed is thusstirred or `spread oveii: the bed 4of the `jig anastratifieationef thisfeed material is thereby `considerably enhanced., `The settling of the`gold particles having a great speclflcgravity ontopthe bed `is aidedandlasslsted'and the eiciency of the jig is `inip'rovc-:d over 4"those"devices in which flxedr'iflles areemployed.4 f

lA .constantlsupplylof water `provided lon the cuter face of the housinglltoclose the opening 1o.' 1

"pivot ears! 8-0 that bcdfby ineans of feed action imparted.

,inlet duct 65 and as indicated in` equally dis/tended but, in

this water, through the 'operation of the pistonjmeans A intake 'chamber64 during 'aportioi'i of the k,cycle of operation of the bellcrankmechanism 83.4 At

a later/period'f'in the cycle of thejig-"it is forcefully dischargedinto".tlle''lli`i tcl1y of .the-.jig and imparts pressure. to r:theunder side of' theshot bedof the jig.` This pressurerisfproducedbypiston 'means/151 and applied to' the shot bedto cause itto become permeableby raising andthe individual elements to separatethernand to thus 1.6 is drawn intofth'e 'cui .of nuiais introaueedfintethe nuten, and the shot bed is onlyraised o-nce. l A

vAccording tothe principles of my linvention I produce a current in thehutch, not under pressure of gravity or under the lowerpressuresobtainablefrom ordinary water supplyfsourcesibut withuapositive high pressure imparted; through provideopenings for thervdownward Ypassage of the material being concentrated. Gold Vlhas'agreaterspecific 'gravity than the steel balls normally used inthe shotbed and the rate of fall ofthe ,gold being `concentrated willthereforeibe greater thanthat of the shotbed. The gold will permeatedownwardly through the interstices of thelshot ,bed material andfallinto lthe hutch Figure. 2 where these Vparticles are accumulated inthe lower end of the settling chamber 2| indicated at |91. Theseconcentratesvmay be drawn off through the clean-Out valve 23,

The action of the lever mechanismy 88 andA of the diaphragms therebyactuated is delineated in the Figures 8, 9, and l1. In Figure 8 thediaphragms over each opening are substantially of equal size and theyare also substantially the showing, the action 'of the crank 98 istending to raise' the right oscillatable. lever arm 89 and to d istendfurther the inlet diaphragm 16. rThis action maintains the valve member13 tightly closed While at the same time the valve member r6l is drawnopen against the urgence fof the spring B6 tof permit the inward flow offluid through the ductv '65, which operation will culminate with theiilling ofy the chamber 54. Simultaneously, the piston means "i5 isbeingforcefully depressed into; the fluid of the hutch and to applyforcetherein to create v a current that will flow to the underside of thepermeable jig r,bed andv open it. Of course, in Figure S the pistonmeans 'I5 has only travelled through' an initial portion of its strokeand as can beseenin FigureB it will be further depressed into the vjighutch.

The chamber 64 is shown completely filled in Figure Q'and when thediaphragm isdistended as shownthe'valve 61 closes whenH the urgence ofits spring overcomes the current of the inflowing fluid. Throughout therdownward feeding stroke of the piston means 15, the valve 61' willremain closed but the valve 'I3 will open to permit the flow of fluidinto the hutch during retracting or upward stroke 01y the piston means15, the initial stages of which stroke are yillustrated in Figurel l0;The vacuum that'would normally create a suck-back on vthe under side ofthediaphragm when it raises is compensated for by the incoming flow ofthe fluid that was in chamber Sil. During the retracting stroke s of thepiston means 15 no other force is applied of the levers of the walkingbeam only one charge' the operation of the piston means. I permitthe jigbed to come to rest under the force of gravity by supplying a volume-offluid tothe hutch equal to the increase in volume ofthe hutchproduced byA retracting the current .creating diaphragm.

Thus, during this period thejig'bedis quiet.'

In the showing of Figure A18 wherein I have illustrated the'modiedstructure in whichV the principles; of myjinvention have beenincorporated, the hutch 2|) forms the usual inlet chamber 3|). Thepulsation-chamber'wall 33 is to be seen and has attached'thereto asdescribed, the launders |04 and |05. 'Ihe cover plate Hihas out thereinthe openings V| I; and I2 which are closed by the flexible diaphragmslland H4 lrespectively. Ihe two diaphragms are operated bythe conventionalwalking beam 88 which is pivoted on pin 8S andwhich is oscillated ortilted by the crank 9.8.-' Theqdiaphragms' H3 and Hfi are of differentsize with the smaller being disposed over "occupy the void the opening I|72 to draw fluid into the inlet chamber` H5 through the, duct Hi.;VBecause of the differential between the effect of theptwo diaphragmsintheir up anddown" travel, a small quantity of fluid will be drawny intothe chamber I5 and then when it is drawn intothe hutch by the forceexertedby the .diaphragm H3, it will created by the'upward movement ofthat memberand will thus relieve the suction to a degree that mightotherwise be applied to the underside `of theshot bed. This produces aslightly longer interval during whichv the shot bed is falling freely sothat a greater amount o f metal particles may pass therethrough.

. `I .I 4. This increases vsupports |29.

.-differentflengths.

1 In Figure 19 the same effectas isproduced in of the the Figure 18device is obtained by the use walkingbeam |20 which-has arms |2| andv|22 of Y The effect is tonincrease the leverage applied, on.v thediaphragml H3 andto decrease Ythe leverageA operable upon diaphragm thestroke ofthe diaphragm I I3 whileA at the Sametime suction stroke ofdiaphragm H4 draws less fluid into chamber H5.

InfFigures 20 andl21 I teachv the use of a variable fpivot for therwalking beam I=Z54which is provided with the slot tional pivot hole..

|26 insteadpfto the conven- I A pivot pin |21 has eccentric trunnions|28 which arelmounted in the bearing A leverIEIy is keyed or secured toa trunnion to assistfinturning that member and this lever isv held inadjusted position by means of diaphragms.

thepin |3| which cooperates with the holes in the edge ofthe quadrant|32. By swinging the lever, |39 Vthe crank pin |21 is caused to swingabout the axis of the trunnions and to thus shift the pivot point withrelation to the centers of the l In this way isit possible toshift theactionlof the walking beam and to increase j or decrease vthe stroke ofthepiston'diaphragms.

rjoinder. to hold the plate IQI in adjusted position.

The walking beam |35 shown in `Figure 22 has the usual central pivotalmounting lonpin I3@ but the arms ofthe member are slotted at |31 and|38` and the pins |39 and Idil are tted thereto.' The cover plate MI ismovablel laterally across theupper mouth of the hutch |42 and gasket Y|43 prevents leakage at the point of Slotted arms :IM: are engagedbybolts By sliding l ore being milled.

` tioned `over the jig the plate laterally the relative distancesbetween the pivot pin |36 and the point of attachment of the'diaphragmsI I3 to the arms of the walking beam |35 may be varied to increase anddecrease the respective leverages.

By the use of this arrangement various sizes of diaphragms may beemployed in the adapting of the jig to the conditions under which it maybe required to operate. This device is particularly useful in running.pilot or test milling operations upon a type of ore. When an ore milldesigner is called upon to specify the type of equipment that should bebuilt into an ore mill he must fit the equipmentto the demands of theVarious slight alterations will often produce resultswhere failure hadexisted before. The mechanism of Figure 22 is primarily useful for suchtesting andexperimentlng.

I claim: 1. In a mineral jig wherein a pulsating current is employed in`a jig hutch to periodically increase and decrease the permeability of ajig bed under a flow of feed material, reciprocal means for imparting anintermittent current to the fluid in said jig hutch, means forintermittently introducing fluid to said jig with force, saidintroduction of fluid being timed to occur during the retracting strokeof said reciprocal current imparting means, a rotatable shaft havingmeans thereon for reciprocating said reciprocal means, a plurality ofvibrator mounts on said hutch adjacent said jig bed, each vibrator mountsupporting an upper and a lower segmental seat, a resilient vibratorball positioned in the seats of each vibrator mount,` an open bottomriflle box posibed and having a plurality of trunnions, each trunnionassociated with a vibrator ball, an unbalanced shaft associated withsaid rime-box to agitate the same, means associating said unbalancedshaft with said rotatable shaft for rotation therewith, and means forrotating said rotatable shaft.

2. In a mineral jig wherein a pulsating current is employed in a jig`hutch to periodically increase and decrease the permeability of a jigbed under a flow of `feed material, reciprocal means for imparting anintermittent current to the fluid in said jig hutch, means forintermittently introducing fluid to said jig, said introduction of fluidbeing timed to occur during the retracting stroke of said reciprocalcurrent imparting means, a rotatable shaft having means thereon forreciprocating said reciprocal means, a plurality of vibrator mountsabove said jig bed each including a resilient member, an open-bottomrile box having a trunnion associated with each resilient member tosupport the rillle-box above said jig bed, an unbalanced shaftjournalled on said rifile-box to agitate the same, means associatingsaid unbalanced shaft with said rotatable shaft for rotation therewith,and means for rotating said rotatable shaft.

3. In a mineral jig wherein a pulsating current is crease and decreasethe permeability of a jig bed under a flow of feed material, reciprocalmeans for imparting an intermittent current to the fluid in said jighutch, means for intermittently introducing fluid to said jig, saidintroduction of fluid being timed to occur during the retracting strokeof said reciprocal current imparting means, a rotatable shaft having`means thereon for reciprocating said reciprocal means, a flexibleopen-bottom riflle box supported in spaced relation above said jig'bed,an unbalanced shaft associated with said riille-box to agitate the same,means associating said unbalanced shaft for rotation therewith with saidrotatable shaft, and means for rotating said rotatable shaft.

4. In a mineral jig wherein a pulsating current is employed in a jighutch to periodically increase and decrease the permeability of a jigbed under a flow of `feed material, reciprocal means for imparting anintermittent current to the fluid in said jig hutch, means forintermittently introducing fluid to said jig, said introduction of fluidbeing timed to occur during the retracting stroke of said reciprocalcurrent imparting means, a rotatable shaft having means thereon forreciprocating said reciprocal means, an open-bottom riille box flexiblysupported in spaced relation above said jig bed, an unbalanced shaftassociated with said rime-box to agitate the same, means associatingsaid unbalanced shaft for rotation therewith with said rotatable shaft,and means for rotating said rotatable shaft.

LESLIE E. TU'I'HILL.

employed in a jig hutch to periodically in-`

